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A174200 The sequence of numbers which, when entered on a standard telephone numeric keypad, produce the letters a thru z. Letters are accessed by one or more presses of a single key. 0
2, 22, 222, 3, 33, 333, 4, 44, 444, 5, 55, 555, 6, 66, 666, 7, 77, 777, 7777, 8, 88, 888, 9, 99, 999, 9999 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Method of entry commonly used on cellular telephones for text-messaging. Not the sequence of a-z used in telephone numbers.
LINKS
EXAMPLE
To generate the letter 'a', type '2', to generate 'b', type '2' twice, or '22'.
CROSSREFS
Sequence in context: A350965 A336894 A037567 * A137109 A002276 A112893
KEYWORD
nonn,fini,full
AUTHOR
Adam Risi (ajrisi(AT)gmail.com), Mar 11 2010
EXTENSIONS
Corrected by Clive Tooth, Jan 28 2016
STATUS
approved

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Last modified June 19 09:37 EDT 2024. Contains 373501 sequences. (Running on oeis4.)